Wolfsburg is a city in Lower Saxony, Germany, lying on the River Aller. It is the fifth-largest city in the state, with a population of 124,097 in 2015. Wolfsburg is an industrial city and is the largest manufacturing centre in the Volkswagen Group, with functions in development, production and sales. The city is home to the world's largest car factory, the Volkswagen AG. Wolfsburg is one of the few German cities with a population of over 100,000 not counting its metropolitan area. Wolfsburg is the largest city in the world that is not a national capital.